Calculate the required cable length
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The distance from the measurement point to the control room can be determined using the piping diagram. But once one is near the measurement point, what calculation is used to determine its height? For example, for the temperature measurement point TI101 of the waste heat boiler, the distance from the waste heat boiler to the control room can be determined using the piping diagram. But once one is at the location of the waste heat boiler, how can the distance to TI101 be calculated? Should it be roughly estimated based on the height of the waste heat boiler? For the process details, they only gave me the flowchart with control points and the pipe layout diagram; nothing else was provided.
The person in charge of the process only gave me the flowchart with control points and the pipe layout diagram; nothing else was provided
It depends on how precise you need it to be. For general design purposes, there are two approaches: one involves 3D modeling, which is straightforward – once you draw it out in the model, the length will be clear, and the deviation won’t be significant; you can then add a margin of 5% to 10%. If the design for the enclosure only includes 2D drawings and no 3D modeling, we usually estimate by taking an approximate length – it’s better to overestimate. This is because the routing of the wires in the 2D drawings isn’t fixed; it depends on how the contractor carries out the work. They need to consider factors such as aesthetics, so the actual routing might be very different from what one imagines, with extra detours. Therefore, it’s sufficient to estimate a rough length, round it to the nearest tenth, then add the height and round that as well to the nearest tenth, and finally multiply by a margin. Having a slightly higher value isn’t a problem, as it’s almost always insufficient. . . :o
I asked the process team for a detailed list of the pipe connections for the specific equipment. For other items, such as pumps, I simply made estimates, opting for higher values. Also, could my cable tray layout be drawn directly on the pipeline diagram provided by the process team, with the pipelines marked on it removed?
There are scales on the diagram; you can measure it.
There are scales on the diagram, so measurements can be taken; the exact value still needs to be calculated based on the actual conditions on site, with an appropriate increase added as well.
The length of the plane can be measured using the pipe layout diagram. What about the height of the measurement point? For example, there is a temperature measurement point on the equipment, but its height is not indicated in the pipeline diagram. How do I measure this length?